首先引入jar包
<properties>
<log4j2.version>2.16.0</log4j2.version>
<slf4j.version>1.7.25</slf4j.version>
</properties>
<!--slf4j-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!--slf4j use Log4j2-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j2.version}</version>
<exclusions>
<exclusion>
<artifactId>slf4j-api</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<!--log4j2-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
</dependency>添加和配置log4j2实现类
// configConstant中配置日志系统实现类 me.setLogFactory(new Log4j2LogFactory()); SqlReporter.setLog(true); // sql日志
import com.jfinal.log.ILogFactory;
import com.jfinal.log.Log;
/**
* Log4j2LogFactory.
*/
public class Log4j2LogFactory implements ILogFactory {
public Log getLog(Class<?> clazz) {
return new Log4j2Log(clazz);
}
public Log getLog(String name) {
return new Log4j2Log(name);
}
}import com.jfinal.log.Log;
import org.apache.logging.log4j.Level;
public class Log4j2Log extends Log {
private org.apache.logging.log4j.Logger log;
Log4j2Log(Class<?> clazz) {
log = org.apache.logging.log4j.LogManager.getLogger(clazz);
}
Log4j2Log(String name) {
log = org.apache.logging.log4j.LogManager.getLogger(name);
}
public static Log4j2Log getLog(Class<?> clazz) {
return new Log4j2Log(clazz);
}
public static Log4j2Log getLog(String name) {
return new Log4j2Log(name);
}
public void trace(String message) {
log.log(Level.TRACE, message);
}
public void trace(String message, Throwable t) {
log.log(Level.TRACE, message, t);
}
public void debug(String message) {
log.log(Level.DEBUG, message);
}
public void debug(String message, Throwable t) {
log.log(Level.DEBUG, message, t);
}
public void info(String message) {
log.log(Level.INFO, message);
}
public void info(String message, Throwable t) {
log.log(Level.INFO, message, t);
}
public void warn(String message) {
log.log(Level.WARN, message);
}
public void warn(String message, Throwable t) {
log.log(Level.WARN, message, t);
}
public void error(String message) {
log.log(Level.ERROR, message);
}
public void error(String message, Throwable t) {
log.log(Level.ERROR, message, t);
}
public void fatal(String message) {
log.log(Level.FATAL, message);
}
public void fatal(String message, Throwable t) {
log.log(Level.FATAL, message, t);
}
public boolean isTraceEnabled() {
return log.isTraceEnabled();
}
public boolean isDebugEnabled() {
return log.isDebugEnabled();
}
public boolean isInfoEnabled() {
return log.isInfoEnabled();
}
public boolean isWarnEnabled() {
return log.isEnabled(Level.WARN);
}
public boolean isErrorEnabled() {
return log.isEnabled(Level.ERROR);
}
public boolean isFatalEnabled() {
return log.isEnabled(Level.FATAL);
}
}添加log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration status="OFF">
<appenders>
<Console name="Console" target="SYSTEM_OUT">
<!--只接受程序中DEBUG级别的日志进行处理-->
<ThresholdFilter level="DEBUG" onMatch="ACCEPT" onMismatch="DENY" />
<PatternLayout pattern="[%d{HH:mm:ss.SSS}] %-5level %class{36} %L %M - %msg%xEx%n" />
</Console>
<!--处理DEBUG级别的日志，并把该日志放到logs/debug.log文件中-->
<!--打印出DEBUG级别日志，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
<RollingFile name="RollingFileDebug" fileName="./logs/debug.log" filePattern="logs/$${date:yyyy-MM}/debug-%d{yyyy-MM-dd}-%i.log.gz">
<Filters>
<ThresholdFilter level="DEBUG" />
<ThresholdFilter level="INFO" onMatch="DENY" onMismatch="NEUTRAL" />
</Filters>
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n" />
<Policies>
<SizeBasedTriggeringPolicy size="500 MB" />
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
<!--处理INFO级别的日志，并把该日志放到logs/info.log文件中-->
<RollingFile name="RollingFileInfo" fileName="./logs/info.log" filePattern="logs/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log.gz">
<Filters>
<!--只接受INFO级别的日志，其余的全部拒绝处理-->
<ThresholdFilter level="INFO" />
<ThresholdFilter level="WARN" onMatch="DENY" onMismatch="NEUTRAL" />
</Filters>
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n" />
<Policies>
<SizeBasedTriggeringPolicy size="500 MB" />
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
<!--处理WARN级别的日志，并把该日志放到logs/warn.log文件中-->
<RollingFile name="RollingFileWarn" fileName="./logs/warn.log" filePattern="logs/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log.gz">
<Filters>
<ThresholdFilter level="WARN" />
<ThresholdFilter level="ERROR" onMatch="DENY" onMismatch="NEUTRAL" />
</Filters>
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n" />
<Policies>
<SizeBasedTriggeringPolicy size="500 MB" />
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
<!--处理error级别的日志，并把该日志放到logs/error.log文件中-->
<RollingFile name="RollingFileError" fileName="./logs/error.log" filePattern="logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz">
<ThresholdFilter level="ERROR" />
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %class{36} %L %M - %msg%xEx%n" />
<Policies>
<SizeBasedTriggeringPolicy size="500 MB" />
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
<!--druid的日志记录追加器-->
<RollingFile name="druidSqlRollingFile" fileName="./logs/druid-sql.log" filePattern="logs/$${date:yyyy-MM}/api-%d{yyyy-MM-dd}-%i.log.gz">
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss}] %-5level %L %M - %msg%xEx%n" />
<Policies>
<SizeBasedTriggeringPolicy size="500 MB" />
<TimeBasedTriggeringPolicy />
</Policies>
</RollingFile>
</appenders>
<loggers>
<root level="DEBUG">
<appender-ref ref="Console" />
<appender-ref ref="RollingFileInfo" />
<appender-ref ref="RollingFileWarn" />
<appender-ref ref="RollingFileError" />
<appender-ref ref="RollingFileDebug" />
</root>
<!--记录druid-sql的记录-->
<logger name="druid.sql.Statement" level="debug" additivity="false">
<appender-ref ref="druidSqlRollingFile" />
</logger>
<logger name="druid.sql.Statement" level="debug" additivity="false">
<appender-ref ref="druidSqlRollingFile" />
</logger>
<!--log4j2 自带过滤日志-->
<Logger name="org.apache.catalina.startup.DigesterFactory" level="error" />
<Logger name="org.apache.catalina.util.LifecycleBase" level="error" />
<Logger name="org.apache.coyote.http11.Http11NioProtocol" level="warn" />
<logger name="org.apache.sshd.common.util.SecurityUtils" level="warn" />
<Logger name="org.apache.tomcat.util.net.NioSelectorPool" level="warn" />
<Logger name="org.crsh.plugin" level="warn" />
<logger name="org.crsh.ssh" level="warn" />
<Logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="error" />
<Logger name="org.hibernate.validator.internal.util.Version" level="warn" />
<logger name="org.springframework.boot.actuate.autoconfigure.CrshAutoConfiguration" level="warn" />
<logger name="org.springframework.boot.actuate.endpoint.jmx" level="warn" />
<logger name="org.thymeleaf" level="warn" />
</loggers>
</configuration>添下来就能愉快地使用了
private static final Log log = Log.getLog(XXX.class);
log.error("", e);
log.info("");
